Every year, millions of UK drivers get their vehicles MOT test done to ensure it meets safety and environmental standards.
However, failing an MOT can be inconvenient, frustrating, and costly. With updated DVSA regulations and evolving technology in electric and hybrid cars, it’s important to understand the most common MOT failures in 2025.
In this guide, we’ll list the top 5 reasons cars fail MOT tests in 2025 and also cover how to fix these issues and provide practical tips to help ensure you pass your MOT on the first attempt.
Why Do Cars Fail MOT Test in 2025?
The MOT test is a legal requirement set by the UK’s Driver and Vehicle Standards Agency (DVSA) to ensure that vehicles meet safety and roadworthiness standards. In 2025, stricter rules — including fraud prevention measures and mandatory image uploads during the test — show that garages are now keeping much closer records.
According to industry insights, around 40% of vehicles fail their MOT on the first attempt due to preventable issues. By addressing these common failures in advance, you can save time, money, and avoid unnecessary stress.
Top 5 common MOT failures in 2025
Based on DVSA data, automotive industry reports, and community insights, here are the most frequent reasons why vehicles fail their MOT in 2025, along with suggested actions to fix them.
1. Faulty Lights and Electrical Systems
Lighting and electrical system issues account for 25% of MOT failures. These include broken headlights, taillights, indicators, and number plate lights. In 2025, testers also inspect advanced lighting systems in electric and hybrid vehicles, such as malfunctioning LED or adaptive lighting features.
How to fix it:
- Inspect all lights before your MOT: Check your headlights, taillights, brake lights, indicators, and number plate lights. If any bulbs are not working, replace them in advance.
- Clean the lenses: Dirty or faded lenses reduce light output. Clean them with a proper cleaner, and if they’re damaged or too worn out, consider replacing them.
- Wiring issues: If you suspect a fault in the electrical system, consult a qualified mechanic. Have any damaged wiring or electrical components professionally diagnosed and repaired.
Pro tip: For electric vehicles, ensure that the adaptive lighting system is fully functional, as it is now a part of the MOT check in 2025.
2. Worn or Damaged Tyres
In a recent survey of 15,000 drivers, 45% believed that tyre issues are the main reason for MOT failure.
Why it fails: Illegal tread depth, uneven wear across the central three-quarters of the tyre, cuts, or bulges are all common reasons for MOT failure. In 2025, testers are also stricter about tyre pressure monitoring systems (TPMS), especially on newer vehicles.
How to fix it:
- Measure tread depth:Use a tread depth gauge to check all tyres. Replace any tyre if the tread depth is below 1.6mm (the legal minimum).
- Inspect for damage:Look for cuts, bulges, or uneven wear on the tyre surface. If you notice any of these signs, replace the tyre immediately.
- Check TPMS:Ensure your Tyre Pressure Monitoring System (TPMS) is working properly. A TPMS fault is now considered a failure point in the 2025 MOT.
Pro Tip: Rotate your tyres regularly and check tyre pressure monthly to avoid pressure-related issues and extend tyre life.
3. Brake System Problems
Brake issues—including worn pads, damaged discs, and ABS faults—account for around 12% of MOT failures. In 2025, MOT testers will inspect braking systems with greater attention, especially in electric and hybrid vehicles, where regenerative braking must function correctly.
How to fix it:
- Brake Pads and Discs:Replace brake pads if they are worn below the minimum thickness (usually less than 3mm). Also, check the discs for scoring or wear and replace them if necessary.
- Brake Fluid:Ensure the brake fluid level is topped up. Brake fluid should be replaced every two years to maintain braking performance.
- Test ABS and Regenerative Braking:In EVs and hybrids, have a mechanic verify that the ABS and regenerative braking systems are working properly.
Pro Tip: Listen carefully for any grinding or squealing noises when braking. These sounds can be early signs of brake issues that need attention.
4. Suspension Issues
Worn suspension components—such as damaged shock absorbers, broken springs, or loose parts—account for around 10% of MOT failures. These parts affect the vehicle’s handling and safety, and in 2025, testers have become stricter in checking suspension systems.
How to fix it:
- Check shocks and springs: Inspect for leaks, corrosion, or broken components. If you notice any issues, replace the affected parts promptly.
- Test handling:If your car bounces excessively or pulls to one side while driving, have it checked by a mechanic for potential suspension problems.
Pro Tip: Avoid driving on rough or uneven roads when possible, and steer clear of overloading your vehicle, as this can reduce suspension lifespan.
5. Emissions and Exhaust System Failures
Emissions failures are common, especially in diesel and petrol vehicles, accounting for a significant percentage of MOT rejections. In 2025, stricter emissions standards are in place. Older vehicles often fail due to issues such as a missing catalytic converter, a common failure point. While electric vehicles are exempt from emissions tests, their battery cooling systems must still be fully functional.
How to fix it:
- Service your vehicle regularly:Routine servicing ensures the engine runs efficiently and produces fewer emissions.
- Check the exhaust system:Inspect the exhaust for leaks, corrosion, or missing components like the catalytic converter. Replace any faulty or missing parts.
- Use quality fuel:Using high-quality fuel can help reduce harmful emissions and keep the engine running cleaner.
Pro tip: For diesel cars, drive at higher RPMs before the test to help clear the diesel particulate filter (DPF) and improve emissions performance.
How to Avoid MOT Failure
Avoiding an MOT failure can save you both time and money. Follow these practical tips to help ensure your vehicle passes:
1. Do a Pre-MOT Checklist:
At home, check all essential items such as lights, tyres, brakes, and mirrors. In 2025, use DVSA-approved apps or tools to run a basic diagnostic and safety check.
2. Book a Pre-MOT Inspection:
Many garages offer a pre-MOT check. This can highlight potential issues before your actual test.
3. Stay Up to Date with 2025 Rules:
Be aware of updated regulations like mandatory image uploads and fraud prevention measures. Regularly inspect suspension and emissions systems—especially every 12,000 miles.
4. Address MOT Advisories Promptly:
If your previous MOT had advisory notes, fix those issues on time. Ignoring them can lead to failure in your next test.By staying proactive and informed, you can significantly reduce the risk of MOT failure.
Financial Impact of MOT Failure
Failing your MOT can have a significant financial impact due to several direct and indirect costs:
- Re-test fees:Depending on the type of failure, you may have to pay a partial or full fee for a re-test.
- Repair costs:Fixing failed components, such as brakes, tyres, or suspension, can be expensive, especially if multiple issues are identified.
- Wasted time:Delays caused by rebooking, arranging repairs, and visiting garages can cost you valuable time.
- Higher insurance premiums:A failed MOT can negatively affect your vehicle’s history, potentially increasing your insurance costs.
- Risk of fines and accidents:Driving without a valid MOT is illegal and can lead to penalties. If the failed item is safety-critical, it also increases the risk of an accident.
Avoiding MOT failure not only protects your safety but also helps manage your finances more effectively.
FAQs
Q1: What happens if my car fails the MOT in 2025?
If your vehicle fails the MOT, you’ll receive a failure certificate. You can still drive the car only if your current MOT hasn’t expired and the vehicle is roadworthy. You have 10 working days to get the necessary repairs done and return for a re-test.
Q2: Can I remove an MOT advisory?
No, MOT advisories cannot be removed from the record as they highlight potential issues found during the test. However, you can and should fix them to avoid future MOT failures.
Q3: Is there an updated MOT test in 2025?
Yes, the 2025 MOT includes updated DVSA rules such as mandatory image uploads, stricter checks for electric and hybrid systems, and enhanced security standards.
Q4: What does it cost to fix an MOT failure?
The cost depends on what caused your MOT to fail. Minor issues may be inexpensive, while more serious faults, like suspension or braking system failures, can be more costly to repair.
Conclusion
Pass your MOT test in 2025 with confidence. Most MOT failures happen due to preventable issues such as faulty lights, worn tyres, brake problems, suspension faults, and emissions failures. By checking these common areas before your test and staying updated with the new DVSA 2025 regulations, you can significantly increase your chances of passing on the first attempt.
Be proactive—inspect your vehicle, fix any faults, and book your MOT with trusted garage.